Combined casing head and blow-out preventer



June 23, 1931.

Filed March 15, 1950 Patented June 23, 1931 UNITED STATES PATENT FFIc GRANVILLE a v HUMASON, or nousrom' TEXAS COMBINED CASING HEAD AND BLOW-OUT PREYENTER Application filed March 13, 1930.

the well around said inner pipe.

Another object of the invention is to provide in a device of the character described, a pacln'ng sleeve which may be readily 1nserted into the bowl of the casing head around the inner pipe and automatically locked therein, by releasable lockmg "means provided for the purpose and having ashp splder associated therewith to recelve pipe engaging slips to support the inner pipe suspended in the well. 0

A still further feature of the invention 1s to provide a blow out preventer of the character described which i's of such a construction that a drill stem, tubing or other lnner pipe and the couplings thereof may be readily passed therethrough in lowering or withdrawing said irner pipe. A

With the ab; re and other objects in view, this invention has particular relation to certain novel features of construction, operation and arrangement of parts, an example of which is given in this specification and illustrated in the accompanying drawings where- 1n Figure 1 shows a side elevation of a preferred form of the device shown partly in section.

Figure 2 shows a cross sectional view thereof and Figure 3 shows a side elevation partly in section of a modified type thereof.

Referring now more particularly to the drawings wherein like numerals of reference designate similar parts in each of the figures the numeral 1 designates a casing in a well bore to the upper end of which the tubular bowl 2 of the casing head is con- Serial No. 435,404.

nected. This bowl has the flow lines 3 which are controlled by conventional valves (not shown). Above the flow lines the bowl has an internal annular downwardly 'taperlng seat 4.

In the preferred form of'the invention there is a packer sleeve 5 formed of rubber or vother similar material and anchored to the lower end of which there is an annular metal ferrule 6 whose lower end is beveled to conform to the shape of and to fit against the seat 4. Anchored to the upper end of the sleeve 5 there is an annular ferrule 7 which is extended upwardly forming the slip spider 8 having the upwardly flared seat 9 and provided with the external annular shoulder 10 at its upper end. This spider has the ex- 7 ternal upwardly pitched ratchet teeth 11 and mounted in opposite sides of the casing head bowl are the radially movable dogs 12 which are attached to the outwardly extending stems 13. These stems work through the re "verselyarranged inner and outer cap like bearing members 14, 15. Coil springs 16 surround said respective stems and are inthe opposing teeth of the corresponding spider.

Between the external shoulder 10 of the spider 8 and an opposing internal shoulder 19 in the bowl 2 there are located a' plurality of adjusting rings 20 for a purpose to be hereinafter stated,

In the form shown in Figure 3 the lower ferrule 6' is of sufiic'ient inside diameter to permit the couplings of the inner pipe to pass therethrough and the upper ferrule 7 is extended downwardly to form a sleeve like housing 21 whose lower end is screwed onto the lower ferrule and between these ferrules there is clamped a plurality of annular rubber rings as 22'designed to fit closely around the inner pipe but which are sufiiciently yieldto pass therethrough in lowering said pipe into or withdrawing it from the well. In this form of the device the spider 8 is sub'stantiale of the device the spider 8 has the external teeth and the bowl is provided with the dogs 12 to engage said teeth mounted as, and for the purpose, hereinabove explained. The inner pipe is indicated by the numeral 23 and its sections are connected by the couplings as 24: h-ereinabove referred to. The pipe holding slips designed to be seated in the spider seat 9, for a purpose to be hereinafter stated are indicated by the numeral 25. These slips are tapered downwardly and have the inside pipe engaging teeth and are substantially of the conventional construction.

In carrying on drilling operations the slips 25 will be removed and the unit embodying the packing sleeve 5 will be mounted on the drive bushing of the rotary table by means of which the drill stem is rotated with the bowl 2 located preferablyunderneath the derrick floor. In case a blow out is threatened I said drive bushing may be removed and the packing sleeve assembly dropped down rods 13 and the packing sleeve assemblies then lifted out.

The drawings and description disclose what is now considered to be preferred forms of the invention by way of illustration only per end of an outer pipe in a Well bore and I having an inside seat and an outlet beneath said seat, a sleeve like packing in said bowl and seated on said seat, said packing being shaped to surround an inner pipe and having. an expansible element and its upper end being formed into a spider having a slip seat, pipe engaging slips in said slip seat, andreleasable interengaglng means between the bowl and packing and effective to retain the a packing in the bowl, said interengaging means comprising teeth on the spider and a yieldably mounted dog in the bowl engageable with said teeth. 7

In testimony whereof I have signed my name to this specification.

GRANVILLE A. HUMASON.

through the rotary table onto the seat 4 around the drill stem or inner pipe 23 and the dogs 12 will engage with the teeth of the spider 8 and thus secure said'unit within said bowl. The upward pressure of the fluid in the Well against the lower ferrule 6 will expand the packing sleeve 5 and usually pre vent the escape of said fluid. If, however,

fluid should escape, the slip 25, may be in sertedin the spider seat 9 and then the drill stem then lowered and the weight'thereof will further expand said sleeve to prevent any leakage. The downward movement of the spider 8 relative to the bowl 2' and the pressure thereof exerted against the sleeve 5 may be regulated by the number of rings 20 provided for that purpose.

When the well is under control, a suitable Christmas tree connection as 26 maybe attached to the upper end of the bowlfor the purpose of connecting the well known flow connection or what is commonly known as a Christmas tree thereto.

The form shown in Figure 3 will be most frequently used when the pressure within the well is not great, and when it is desired to elevate or lower the inner pipe or tubing and at the same time confine the outward 

